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Publication
Physical Review A. Atomic, Molecular, and Optical Physics
Paper
Four-party unlockable bound entangled state
Abstract
A four-party unlockable bound entangled state was presented. It was shown that in the case of mixed entangled state it is possible to distill some nearly pure entanglement using local quantum operations and classical communications among the parties. It was also shown that the entanglement was not available without the coming together of the two parties, thus the state is bound entangled.